Hydraulic gear puller



Oct; 20, 1931.

J. E. LYNCH HYDRAULIC GEAR FULLER Filed Dec. 31, I929 2 Sheets-Sheet l Jllliyzufi Patented Oct. 20, 1931 s'rArEs razazsz um n. LYNCH, or 'rnmnna, rnxas EYlDBAULIC ow rum-Ea Application filed December 31, 1929. Serial No. 417,772.

This invention relates to pulling devices, more particularly a device for pulling gears or the like.

I The primary object of the present invention is to provide a gear puller by means of a which a steady, smooth and powerful pulling force may be applied to a gear to remove the same from its supporting shaft.

The invention broadly contemplates the 1 provision of a pulling device employing fluid pressure, wherein a cylindrical ody is provided having a iston in and extensible from one end thereo with means operated from theother end of the cylinder for injecting a liquid such as oil or water into the cylinder behind the piston to force the same outwardly against the end of a shaft, gear-engaging arms being disposed upon opposite sides of the cylinder and adjustably connected there- 99 with through the medium of a shiftable collar mounted thereon.

Still another object of the invention is to provide a pulling device wherein the collar above" referred to may be easily and quickly coarsely adjusted with respect to a gear, so that the piston element need onl be moved a relatively short distance to e ect the removal of the ear.

Another ob ect of the invention is to pro vide a new and novel means for mounting an arm-carrying collar in lace upon the cylinder of the device, .where y quick assembly of the structure may be brought about.

' The invention will be best understood from a consideration of the following detailed description taken in connection with theaccompanying drawings forming part of this specification, with the understandin however, that the invention is not 00 ed to any strict conformity with the showing of the drawings but may be'change'd or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings Y Figure 1 is a view in side elevation of the gear puller embodying the present invention showing the same applied;

't e forward end of the cylinder by theuse of in position thereby.

Figure 2 is a sectional view taken onthe line 2-2 of Figure 1; v

t Figure 3 is a transverse sectional view taken upon the line 3-3 of Figure 1;

Figure 4 is a sectional view through the pulling arm supportin 'collar and the split nut associated therewith;

Figure 5 is a transverse sectional view throu h the collar and nut shown in Figure 4; an

Figure 6 is a view partly in section and partly in side elevation of a modified construction of the gear-engaging bars and method of connecting the same with the pullmg arms.

Referring more particularly to the drawings, wherein like numerals of reference indicate corresponding parts throughout the several views, the numeral 1 indicates the body of the gear puller embodying the pres-. ent invention, which body'as shown is in the form of a cylinder open at each end and having removably positioned therein adjacent one end, the forward end, the partition plate 2'through the center of which an a erture 3 is formed. The wall, ofthe cylin er 1 between the partition plate 2 and the adjacent end is materiall thicker than the rest of the c linder wall, t e chamber 4 thus formed in the late 2 housing a piston body as shown.

T e inner face of the cylinder wall adjacent the open forward end thereof is provided with the rib 6 which snugly engages about the piston 5, and the inner face of the wall from this rib to the adjacent end thereof is screw-threaded as indicated at 7 to receive the packing nut 8 which surrounds the iston and maintains the packing material 9 rmly he forward end of the piston 5 is pointed or of cone formation as indicated at 10 and the rear end thereof has secured thereto the plate 11 and washer 12, by means ofa screw 13 passing therethrou h and into the rear end of the iston. As s own the plate is of greater 'ameter than the piston body so that it will come into contact with the inner side of the rib 6 when the piston is moved forwardly in thechamber 4 and thus prevent readily seen t tained in a plate 18 is a needle-valve stem 32 the screw-threads 35 w the complete escape of the piston therefrom.

The rear face of the partition plate 2 has formed thereon around and concentric with the aperture 3 an interiorl threaded collar 14 and adjacent the ed o the plate there is formed a sleeve 15 w ich communicates at its inner end with an aperture 16 formed through the partition late in the manner shown, the wall of this s eeve having a lateral opening 17 therethrough for the purpose.

hereinafter to be described.

Threadably secured in the rear end of the cylinder 1 is a head plate 18 through the central portion of which opens one end of a piston guide 19 which, when the head plate 18 is in p ace, extends through the cylinder to and is engaged in the collar 14 in the manner shown.

The inner end of the tube 19 is normally closed b a s ring-pressed check ball 20, the spring t ere or being interposed between the ball and the artition 2 so that as will be e passage of a fluid past this check will be permitted only from the rear portion of the cylinder into the chamber 4 1n which the piston is housed, the fluid of course being confined between the partition 2 and the rear end of the piston 5 in the manner shown. Opening through the side of the tube 19 adjacent the check 20 is an inlet opening 21, this opening being controlled by the inlet check valve 22"which, as shown, only permits fluid to passfr'o'rn the interior of the cylinder into the tube 19."

Reciprocably mounted in the tube19 is a small piston 23, the forward end of which is provided with a suitable washer 24 while the rear end passes through a packing 25 maintained in the enlarge 19 by a packing nut 26.

At its outer end the piston23 has a loose connection as at 27 with a lever 28, this connection being inwardly of one end of the lever the adjacent end thereof being pivotally secured as at 29 to a suitable post 30 carried by the head plate 18.

Extending through and; threadably reore 31 formed through the head ointed inner end of which extends into the s to close the passage 16 throu h the plate 2, the outer end of this needle-va ve stem car inga knurled head 33 by which it may asped for rotation as necessary. In order to facilitate the introduction of oil or water into the cylinder 1 without the necessity of removin the head 18, a plugged aperture 34 is rovi ed through the head plate as shown. e cylinder 1 1S rovided exteriorly with ich extend throu bout the length thereof as clearly shown in igure 1. Engaged about the cylinder is a two-part frusto-conical nut 36, the parts thereof being pivotally secured together as at 37 so that the parts of the nut may be readily separated outer endof the tube' eeve 15' for removal but maintained in connected relation so that replacement thereof may be easil effected.

A apted to receive and surround the split nut 36 is a ta ered collar 38 which carries the diametrica ly oppositely positioned and extended pairs of arms 39, each pair of arms being rovided upon the outer edges thereof with t e transverse notches 40.

As shown in Figure 3 the arms of each pair are arranged in spaced parallel relation, and when the puller is in operation there is disposed between the same a pull-bar 41, the outer end of which is provided with a crosshead 42 which extends across the arms and engages in certain of the notches 40. The opposite ends of these bars 41 are hooked as indicated at 43 to facilitate their connection with a gear member, such a gear being shown and indicated by the numeral 44.

In operation the cylinder 1 is directed toward the end of the shaft 45 carrying the gear to be removed, the pointed end of the piston 5 bein placed upon the longitudinal center thereoi A coarse adjustment of the split nut and collar is then quickly made to place the arms 39 substantially in the right position for the hooked ends 43 of the pullars 41 to conveniently enga e behind the gear, the cross-head of each bar being 511- ready coupled with and extending transversely of a pair of the arms. With the puller thus positioned the lever 28 is actuated to reciprocate the piston 23, this operation causing the fluid in the rear portion of the cylinder to be drawn through the check valve 22 and discharged through the check 20 into the chamber 4 behind the piston 5. The piston is of course compelled 'to' move out of the chamber 4 against the end of the shaft 45 and thus exert a pull upon the rods 41 which will result in the removal of the gear from the shaft. During the foregoing operation the pointed forward end of the needle-valve stem 32 will, of course, be firmly positioned in the bore 16.

Followin the removal of the gear the stem 32 is rotate to open the bore 16 and allow the compressed fluid to flow back into the rear end of the cylinder 1, the return movement of the piston 5 being effected in any suitable manner, such for example as by the a plicationof pressure to the pointed end ereof.

In Figure 6 a sli ht modification of the structure thus far escribed is shown, this modification being in connection with the pull-rods by means of which the arms 39 are coupled with the gear 44. Some gears are provided with apertures through the web portion lyin between the hub and the toothed rim t ereof, and under some conditions it might be preferable to engage the ull-rods in these apertures instead f hooking them over the edge of the gear. For this purpose I provide the threaded pull-rods 46 upon the forward ends of which nuts 47 may be mounted after the forward ends of the rods have been extended through the apertures in the gear body. The other ends 'of the rods are then located between the powerful pull may be applied to a gear with out the expenditure of a material amount of energy on the part of the user of the device. It will also be appreciated that the present gear puller will enable the user to perform an operation quickly because of the manner in which a quick rough adjustment of the arms may be made by shifting the collar and opening the split nut so that it may be moved longitudinally of the cylinder independently of its threaded engagement therewith.

Having thus described my invention, what I claim is 1. A gear puller comprising a cylinder having a partition therein adjacent one end forming a piston chamber, a piston within said chamber extensible through the adjacent end of the cylinder for engagement with a gearsupporting shaft, the cylinder upon the other side of the partition being adapted to contain a fluid a tube within the fluid containing portion of the cylinder having a valved inlet from the cylinder adjacent the partition and a valved outlet through the partition into said chamber, a piston within said tube, said cylinder being exteriorly threaded throughout, a two-part collar surrounding and threadably connected with the cylinder, a body surrounding said collar and detachable therefrom carrying laterally projecting arms, and gear en gaging rods each adj ustably connected with said arms.

2. A gear puller comprising a cylinder having a partition therein adjacent one end to form a forward chamber, a piston reciprocable in said chamber and extensible through the adjacent end of the cylinder, the cylinder on the other side of the partition being adapted to contain a fluid, means for pumping the fluid through said partition into thechamber for the ejection of said piston, valve-controlled means for permitting the return of the fluid from the piston chamber, a split interiorly threaded collar surrounding the cylinder, said cylinder being provided with screw threads for connection with the collar, a member surrounding and receiving the collar, two pairs ofspaced arms projecting laterally from said member, and a gear-engaging rod adapted to be adj ustably connected at one end between the arms of each pair.

3. A gear puller of the character described,

comprising a cylinder of integral construc-.

tion throughout and having screw-threads formed upon the interior adjacent one end, a partition plate within the cylinder having connection with said threads and dividing the cylinder into a piston chamber and a fluid reservoir, a piston body within said chamber and having the inner end provided with a surrounding flange having engagement with the adjacent cylinder wall, the outer end of the chamber having means therein surrounding the piston for limiting the movement of.

the same through contact With said flange, a head threadably engaged in the outer end of the reservoir, a tube integral with said head and extending through the reservoir 'end connected with said plate, said tube having a valved inlet leading from the reservoir and a valved outlet at the end adjacent the plate, the plate having an aperture therein in alignment with the outlet and leading into the chamber, a piston mounted in said tube, a valve-controlled aperture formed through the plate for facilitating the return of fluid from the chamber to the reservoir, a pair of gearengaging elements,'and means for adjustably securlng said elements to said cylinder.

4;. In a gear puller, an elongated body having screw-threads formed about the exterior thereof, a member movable longitudinally in said bod, and extensible through one end thereof or engaging the end of a shaft or similar body, means for effecting the movement of said member longitudinally of the first-mentioned body, a two-part interiorly threaded collar surrounding and having threaded engagement with the first-men-' vtioned body, said collar having the outer wall tapered, an annular interiorly tapered body designed to receive said collar, a pair of arms carried by and extending laterally from said annular body, and a pairof rod members each having adjustable connection at one end with an arm and having its other end formed for engaging a body on said shaft.

5. In a gear puller, an elongated body having screw-threads formed about the exterior thereof, a member movable longitudinally in said bod and extensible through one end thereof or engaging the end of a shaft or similar body, means for effecting the movement of said member longitudinally of the first-mentioned body, a two-part interiorly threaded collar surrounding and having threaded engagement with the first-mentioned body, said collar having the outer wall tapered, an annular interiorly tapered body designed to receive said collar, a pair of spaced parallel arms carried by and extending from each of two diametrically opposite points on said annular body, each pair of '4 mamas arms ha transverse recesses upon one side thereof, an a pair of rod members each having a cross-arm adjacent one end, each rod be designed to ition between a pair of the -mention arms with the ends of the cross-arms in the transverse recesses, the other end of each rod being formed for engaging a body carried ufpon the said shaft.

11 testimony wheneo I hereunto aflix my m signature.

JAMES E. LYNCH. 

